宇宙中可能存在其他“地球”
<p><span word="The">The</span> <span word="Kepler">Kepler</span> <span word="orbiting">orbiting</span> <span word="observatory">observatory</span> <span word="was">was</span> <span word="launched">launched</span> <span word="with">with</span> <span word="a">a</span> <span word="simple">simple</span> <span word="mission">mission</span> - <span word="to">to</span> <span word="find">find</span> <span word="other">other</span> <span word="Earths">Earths</span>. <span word="NASA">NASA</span> <span word="describes">describes</span> <span word="it">it</span> <span word="as">as</span> '<span word="a">a</span> <span word="search">search</span> <span word="for">for</span> <span word="habitable">habitable</span> <span word="planets">planets</span>.'</p><p>随着一项简单的任务，寻找其他“地球”，开普勒轨道天文台启动。美国宇航局将其描述为“一次对可居住的星球的搜寻”。</p><p><span word="And">And</span> <span word="analysis">analysis</span> <span word="of">of</span> <span word="its">its</span> <span word="first">first</span> 136 <span word="days">days</span> <span word="of">of</span> <span word="data">data</span> <span word="has">has</span> <span word="already">already</span> <span word="begun">begun</span> - <span word="with">with</span> <span word="scientists">scientists</span> <span word="combing">combing</span> <span word="through">through</span> <span word="scans">scans</span> <span word="of">of</span> 150,000 <span word="stars">stars</span>, <span word="and">and</span> <span word="evidence">evidence</span> <span word="of">of</span> 1,235 <span word="potential">potential</span> <span word="planets">planets</span>.</p><p>通过扫描浏览150,000颗恒星，科学家们已经开始分析梳理头136天的数据，结果表明有1,235颗可能的行星。</p><p><span word="Such">Such</span> <span word="information">information</span> <span word="is">is</span> <span word="fascinating">fascinating</span> <span word="in">in</span> <span word="itself">itself</span> - <span word="but">but</span> <span word="it">it</span> <span word="also">also</span> <span word="allows">allows</span> <span word="scientists">scientists</span> <span word="to">to</span> <span word="work">work</span> <span word="out">out</span> <span word="projections">projections</span> <span word="using">using</span> <span word="statistical">statistical</span> <span word="analysis">analysis</span>.</p><p>这类消息本身很吸引人的，但同时也需要科学家们运用数据分析得出推测。</p><p><span word="One">One</span> <span word="analysis">analysis</span> <span word="has">has</span> <span word="predicted">predicted</span> <span word="that">that</span> <span word="one">one</span>-<span word="third">third</span> <span word="of">of</span> '<span word="sun">sun</span>-<span word="like">like</span>' <span word="stars">stars</span> - <span word="stars">stars</span> <span word="with">with</span> <span word="the">the</span> <span word="classification">classification</span> <span word="F">F</span>, <span word="G">G</span> <span word="or">or</span> <span word="K">K</span> - <span word="will">will</span> <span word="have">have</span> <span word="planets">planets</span> <span word="similar">similar</span> <span word="to">to</span> <span word="Earth">Earth</span>.</p><p>一项分析推测，三分之一的类太阳恒星，即<span word="F">F</span>, <span word="G">G</span> 或 <span word="K">K</span>类恒星，将会有类似地球的行星存在。</p><p><span word="Traub">Traub</span> <span word="says">says</span>, “<span word="About">About</span> <span word="one">one</span>-<span word="third">third</span> <span word="of">of</span> <span word="FGK">FGK</span> <span word="stars">stars</span> <span word="are">are</span> <span word="predicted">predicted</span> <span word="to">to</span> <span word="have">have</span> <span word="at">at</span> <span word="least">least</span> <span word="one">one</span> <span word="terrestrial">terrestrial</span>, <span word="habitable">habitable</span>-<span word="zone">zone</span> <span word="planet">planet</span>.”</p><p><span word="Traub">Traub</span>说：“根据预测，大约三分之一的<span word="F">F</span>, <span word="G">G</span> 或 <span word="K">K</span>类类恒星会至少有一个行星类似地球，拥有可居住区域。”</p><p><span word="Traub">Traub</span> <span word="used">used</span> <span word="statistical">statistical</span> <span word="analysis">analysis</span> <span word="to">to</span> '<span word="predict">predict</span>' <span word="planets">planets</span> <span word="that">that</span> <span word="had">had</span> <span word="not">not</span> <span word="been">been</span> <span word="detected">detected</span> <span word="by">by</span> <span word="Kepler">Kepler</span>, <span word="and">and</span> <span word="whether">whether</span> <span word="they">they</span> <span word="would">would</span> <span word="be">be</span> <span word="within">within</span> <span word="the">the</span> '<span word="habitable">habitable</span> <span word="zone">zone</span>'. <span word="Traub">Traub</span>'<span word="s">s</span> <span word="analysis">analysis</span> <span word="hints">hints</span> <span word="that">that</span> <span word="there">there</span> <span word="may">may</span> <span word="be">be</span> <span word="even">even</span> <span word="more">more</span> <span word="potential">potential</span> '<span word="Earths">Earths</span>' <span word="orbiting">orbiting</span> <span word="them">them</span> <span word="than">than</span> <span word="previously">previously</span> <span word="thought">thought</span> - <span word="and">and</span> <span word="that">that</span> <span word="this">this</span> '<span word="principle">principle</span>' <span word="would">would</span> <span word="extend">extend</span> <span word="to">to</span> <span word="stars">stars</span> <span word="not">not</span> <span word="yet">yet</span> <span word="scanned">scanned</span> <span word="by">by</span> <span word="Kepler">Kepler</span>.</p>
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